Star Wars Battlefront IV Concept Art (FRD

Star Wars Battlefront IV was supposed to take the Star Wars storyline into a different direction, with a perfect "what-if" scenario where the tides were turned. This means the characters you see in 1-6 were flipped, such as Kenobi becoming a sith lord, or Anakin not losing his limbs on Mustafar. Some parts of the story went as far as Anakin killing Yoda in a duel at Naboo. Along with that, Battlefront IV featured larger battles than any other Battlefront before. This meant a large portion of the planet was playable on, and boosting its player count into tremendous amounts during matches. This was truly going to be the largest Star Wars game ever made.
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Basically ROTS, but on Naboo and Anakin kills her out of anger instead or her reason of death in ROTS.

Darth Vader vs Yoda

Palpatine does not turn into a senator in this campaign, but instead immediately shows that he is a Sith Lord right from the start

Anakin kills Yoda in order to finish his training Palpatine is giving him

Naboo is crushed due to the failure of keeping Naboo safe from the CIS army. (Look back at TPM for reference). Rebellion is already built in this state.

In this scene illustrated for the campaign, Anakin is a sith lord, and hasn't lost any of his limbs due to the changed timeline

Some parts of Battlefront III made it into Battlefront IV, including this scene here where X1 states "Stick to the plan Kenobi", referencing the Sith Lord Kenobi that was going to make it in Battlefront IV